Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03
45
● Mechanical trip display:
The Reset button on the RCD pops out when the RCD module trips the molded case circuit
breaker.
● Reset button:
This must be manually reset after the molded case circuit breaker has been tripped by the
RCD module. The molded case circuit breaker can only be reset and switched on again after
the RCD module has been reset.
● Cover:
Modifiable settings for ∆t and I
∆n
.
A sealable transparent cover is available for preventing modification.
● The RCD module has three LEDs:
– Green LED flashes: "Active" -> indicates that the RCD module is functional
– Yellow LED flashes: The fault current is between 25% < I
∆
< 50% of the set I
∆n
value
– Red LED flashes: The fault current I
∆
is greater than 50% of the set I
∆n
value
● Test button:
The functionality of the RCD module is checked with the test button. If the test button is
pressed, differential current is simulated on a test winding attached to the summation current
transformer. When functioning correctly, the RCD module must trip the molded case circuit
breaker.
The test button must be pressed for at least the set delay time Δt.
● A line disconnector:
– makes it possible to disconnect the evaluation electronics of the RCD module from the
circuit without removing the primary cable or the busbars (e.g. before insulation tests).
– Limitation of the maximum RMS withstand voltage to an RMS value of 3500 V AC for
this feature, i.e. the RMS value of the voltage for max. 60 seconds for one insulation
test must not exceed 3500 V.
● Protection function from 50 V AC between phase and neutral conductor
● The RCD module has a surge current withstand capability of I
peak
= 2000 A. The standard
surge wave is defined as 8 / 20-µs waveform.
● The RCD module does not trip in the case of making currents.
Δt ≥ 0 I
rms
= 3000 A
Δt ≥ 60ms I
peak
= 20 x I
n
x √2
● The molded case circuit breaker with differential current protection combination can be
supplied from both sides.
● Matching molded case circuit breaker standard accessories – covers, phase barriers, wire
connectors.
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